U.S. patent application number 13/039440 was filed with the patent office on 2011-06-23 for modular glenoid prosthesis and associated method.
This patent application is currently assigned to DEPUY PRODUCTS, INC.. Invention is credited to THOMAS SCOTT CAMINO, DAREN LLOYD DEFFENBAUGH.
Application Number | 20110153023 13/039440 |
Document ID | / |
Family ID | 35430435 |
Filed Date | 2011-06-23 |
United States Patent
Application |
20110153023 |
Kind Code |
A1 |
DEFFENBAUGH; DAREN LLOYD ;
et al. |
June 23, 2011 |
MODULAR GLENOID PROSTHESIS AND ASSOCIATED METHOD
Abstract
A glenoid implant assembly is provided. The assembly includes a
first component for attachment to the glenoid fossa of a scapula.
The component defines an assembly face of the component. The
assembly also includes a second component removably secured to the
first component. The second component includes an assembly face of
the second component. The assembly face of the second component is
in close approximation to the assembly face of the first component.
The second component is attachable to the first component in a
direction generally normal to the assembly faces.
Inventors: |
DEFFENBAUGH; DAREN LLOYD;
(WINONA LAKE, IN) ; CAMINO; THOMAS SCOTT; (FORT
WAYNE, IN) |
Assignee: |
DEPUY PRODUCTS, INC.
WARSAW
IN
|
Family ID: |
35430435 |
Appl. No.: |
13/039440 |
Filed: |
March 3, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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10951021 |
Sep 27, 2004 |
7922769 |
|
|
13039440 |
|
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Current U.S.
Class: |
623/19.11 |
Current CPC
Class: |
A61F 2310/00017
20130101; A61F 2002/30784 20130101; A61F 2220/0033 20130101; A61F
2220/0025 20130101; A61F 2002/30884 20130101; A61F 2310/00029
20130101; A61F 2/30965 20130101; A61F 2002/30769 20130101; A61F
2002/30332 20130101; A61F 2002/30405 20130101; A61F 2310/00239
20130101; A61F 2002/3069 20130101; A61F 2002/30487 20130101; A61F
2002/30878 20130101; A61F 2002/30736 20130101; A61F 2002/30616
20130101; A61F 2002/30649 20130101; A61F 2310/00179 20130101; A61F
2/4081 20130101; A61F 2002/4085 20130101; A61F 2002/30614 20130101;
A61F 2002/30604 20130101; A61F 2310/00023 20130101; A61F 2310/00203
20130101; A61F 2002/305 20130101; A61F 2002/30331 20130101; A61F
2/30767 20130101; A61F 2002/3092 20130101; A61F 2240/001
20130101 |
Class at
Publication: |
623/19.11 |
International
Class: |
A61F 2/40 20060101
A61F002/40 |
Claims
1. A method for performing arthroplasty on a glenoid fossa of a
scapula comprising the steps of: using a first glenoid component
for attachment to the glenoid; attaching the first glenoid
component to the glenoid; using a second glenoid component for
attachment to the first glenoid component; and attaching the second
glenoid component to the first glenoid component in a direction
generally normal to the longitudinal axis of the first glenoid
component.
2. A method for performing arthroplasty on a glenoid as in claim 1,
wherein the using a first glenoid component step comprises the
steps of using a first glenoid component having at least one of a
protrusion and a fastener for cooperation with the scapula.
3. A method for performing arthroplasty on a glenoid as in claim 1:
wherein the using the first glenoid component step comprises the
step of using the first glenoid component having a tapered
connection; wherein the using the second glenoid component step
comprises the step of using the second glenoid component having a
tapered connection; and wherein the attaching step comprises
attaching the tapered connections to each other.
4. A method for performing arthroplasty on a glenoid as in claim 1,
wherein the using a first glenoid component step comprises the
steps of using a first glenoid component having at an augment for
filling a void in the scapula.
5. A method for performing arthroplasty on a glenoid as in claim 4,
wherein the augmentation defines a wall forming an opening in the
augmentation and the method further includes securing the
augmentation to the scapula via a fastener that extends partially
through the opening.
6. A method for performing arthroplasty on a glenoid as in claim 1,
wherein the using a first glenoid component step comprises the
steps of using a first glenoid component having a protrusion for
cooperation with the glenoid vault of the scapula.
7. A method for performing arthroplasty on a glenoid fossa of a
scapula comprising the steps of: using a first glenoid component
for attachment to the glenoid; attaching the first glenoid
component to the glenoid; selecting a second glenoid component from
a plurality of glenoid components for attachment to the first
glenoid component; and attaching the second glenoid component to
the first glenoid component in a direction generally normal to the
longitudinal axis of the first glenoid component.
8. A method for performing arthroplasty on a glenoid fossa of a
scapula according to claim 7, wherein the plurality of glenoid
components includes at least one glenoid component having an
attachment face and an opposing face, the opposing face being
generally concave, the plurality of glenoid components including at
least one other glenoid component having an attachment face and an
opposing face, the opposing face of the at least one other glenoid
component comprising a generally spherically convex articulating
bearing component.
9. A method for performing arthroplasty on a glenoid fossa of a
scapula according to claim 1, wherein attaching the first glenoid
component to the glenoid includes securing a feature on the first
glenoid component to the glenoid vault.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. application Ser.
No. 10/951,021 entitled "MODULAR GLENOID PROSTHESIS AND ASSOCIATED
METHOD", which is herein incorporated by reference in its entirety.
Cross reference is made to the following applications: U.S.
application Ser. No. 10/951,023 entitled "EXTENDED ARTICULATION
PROSTHESIS ADAPTOR AND ASSOCIATED METHOD", U.S. application Ser.
No. 10/951,024 entitled "GLENOID AUGMENT AND ASSOCIATED METHOD",
U.S. application Ser. No. 10/950,615 entitled "INSTRUMENT FOR
PREPARING AN IMPLANT SUPPORT SURFACE AND ASSOCIATED METHOD", and
U.S. application Ser. No. 10/951,022 entitled "GLENOID
INSTRUMENTATION AND ASSOCIATED METHOD", filed concurrently herewith
which are incorporated herein by reference.
TECHNICAL FIELD OF THE INVENTION
[0002] The present invention relates generally to the field of
orthopaedics, and more particularly, to an implant for use in
arthroplasty.
BACKGROUND OF THE INVENTION
[0003] During the lifetime of a patient, it may be necessary to
perform a total shoulder replacement procedure on the patient as a
result of, for example, disease or trauma. In a total shoulder
replacement procedure, a humeral component having a head portion is
utilized to replace the natural head portion of the arm bone or
humerus. The humeral component typically has an elongated
intramedullary stem which is utilized to secure the humeral
component to the patient's humerus. In such a total shoulder
replacement procedure, the natural glenoid surface of the scapula
is resurfaced or otherwise replaced with a glenoid component that
provides a bearing surface for the head portion of the humeral
component.
[0004] As alluded to above, the need for a shoulder replacement
procedure may be created by the presence of any one of a number of
conditions. One such condition is the deterioration of the
patient's scapula in the area proximate to the glenoid surface as a
result of, for example, glenohumeral arthritis. In such a
condition, the erosion of the patient's scapula is generally
observed posteriorly on the glenoid surface. Such erosion of the
scapula renders treatment difficult, if not impossible, with a
conventional glenoid prosthesis.
[0005] Referring now to FIG. 4 a prior art glenoid implant 1 is
shown. Implant 1 includes a metal body to which a polyethylene
glenoid bearing 3 is attached. A plurality of screws are used to
secure the metal body to the glenoid. A central peg 5 may also be
used to assist in securing the implant 1 to the glenoid.
[0006] Referring now to FIG. 3 a prior art glenoid bearing is shown
as plastic glenoid bearing 6. The plastic glenoid bearing 6
includes a body 7 from which a plurality of pegs 8 extend. The
plastic glenoid bearing may also include a central peg 9, which
likewise extends from the body 7 of the plastic glenoid bearing
6.
[0007] Referring now to FIG. 4, a prior art glenoid bearing is
shown as metal backed glenoid bearing 1. The metal backed glenoid 1
includes a metal backing 2 and a plastic bearing 3. Screws 4 are
used to secure the metal backing 2. A central post 5 may also be
used to secure the metal backing 2.
[0008] Total shoulder replacement surgery includes the replacement
of the humeral component and the glenoid component. The glenoid
component is often the cause for a need of a revision. The need of
a revision for a glenoid component is often due to the loosening of
the glenoid component. Although there are many potential causes for
loosening, there are no adequate solutions to the problem.
[0009] Polyethylene glenoids may wear and the polyethylene wear may
lead to osteolysis and to aseptic wear loosening. Glenoid
components have been provided which include a metal backing for
fixation to the scapula and traditional snapped-in polyethylene
components secured to the metal backed glenoid. These metal backed
glenoids get better fixation, but tend to fail by polyethylene
component disassociation from the metal backing. For a glenoid to
be successful, the implant must be well fixed and the polyethylene
must not disassociate itself from other components such as its
metal backing.
[0010] The present invention is adapted to overcome at least some
of the afore mentioned problems.
SUMMARY OF THE INVENTION
[0011] The present invention relates to a glenoid component for a
shoulder prosthesis. The glenoid component is designed to have a
portion that is used as a removable articular component, which is a
standard component to be used with a total shoulder replacement
system. The removable articular component may be selectively
utilized with any of several fixation components. The components
may be selected relative to specific applications for which they
are intended. A fixation component of the glenoid prosthesis had a
surface which interfaces with the supporting bony structure. The
fixation components may be shaped relative to the specific
condition.
[0012] The removable articular bearing component may have a
composite structure including a molded metal back poly-bearing
surface. The removable articular bearing component may engage the
metal fixation component via a simple selectively releasable
locking means. Such a selectively releasable locking means may be
in the form for example a taper fit, for example a Morse taper.
[0013] Alternatively, the removable articulating bearing component
may be replaced with a spherically convex component for use in
reverse shoulder arthroplasty. This reverse shoulder spherical
component may be reversibly locked to any of the fixation
components. The invention may permit a surgeon to implant a
traditional anatomic prosthesis and later convert the traditional
total shoulder replacement with a reverse shoulder if the patient's
condition warrants it.
[0014] According to the present invention a modular glenoid
prosthesis for the use in total shoulder replacement surgery is
provided. The modular glenoid prosthesis includes a replaceable
molded backed polyethylene component that can be reversibly locked
into a metal fixation component. The metal fixation component may
be of a standard type or may be designed to treat a more pathologic
shoulder condition such as a posteriorly eroded glenoids or
glenoids with other large bony defects.
[0015] The metal fixation component may have a feature, such as a
taper, for example a Morse taper, for reversibly locking the metal
fixation component to the polyethylene component. The locking
feature may additionally be used with a convex spherical component
for use with reverse shoulder prosthesis permitting a surgeon to
implant a traditional anatomic implant and then later, as the
patient's conditions warrant, convert the total shoulder
arthroplasty to a reverse prosthesis or vice versa.
[0016] The articulating surface of the modular glenoid component of
the present invention may be made of a polyethylene, for example an
ultra-high molecular weight polyethylene, and may be made of a
cross-linked polyethylene. The cross-linked, ultra-high, molecular
weight polyethylene should provide decreased wear and thus permit a
thinner glenoid be used. The polyethylene may be molded to a porous
coated spherical surface and the porous coating may be, for
example, sintered to a thin metal substrate. The substrate may have
a feature on the opposite side of the porous coating designed for
locking the component to mating feature on a metal fixation
component. The metal fixation component and the metal backed
polyethylene component provide an example of a molded metal backed
poly-bearing component according to the present invention.
[0017] The bearing component of the present invention may be in the
form of other embodiments that may include alternative materials
such as metal or ceramic for the articulating surface. The metal
fixation component may have a spherically shaped surface that
conforms to the convex spherical shape of the polyethylene molded
metal backed component. The fixation component may have a finite
thickness and the opposite side of the component, the side that
will interface with the bony surface of the scapula, may be porous
coated for enhanced fixation. Screw holes may be positioned in the
fixation component to permit good internal fixation. The bony
interfacial surface may be conjured to fit several glenoid shapes.
These shapes include glenoids that exhibit posterior erosion or
other large defects. The metal fixation component may be porous
coated or include other biologic factors to stimulate bone growth
on the interfacial surface for enhanced fixation.
[0018] According to one embodiment of the present invention, there
is provided a glenoid implant assembly. The assembly includes a
first component for attachment to the glenoid fossa of a scapula.
The component defines an assembly face of the component. The
assembly also includes a second component removably secured to the
first component. The second component includes an assembly face of
the second component. The assembly face of the second component is
in close approximation to the assembly face of the first component.
The second component is attachable to the first component in a
direction generally normal to the assembly faces.
[0019] According to another embodiment of the present invention
there is provided a glenoid implant assembly. The glenoid implant
assembly includes a first component for attachment to the glenoid
fossa of a scapula. The first component defines an assembly face
and attachment feature of the first component. The glenoid implant
assembly also includes a second component removably secured to the
first component. The second component includes an assembly face of
the second component. The second component defines an attachment
feature of the second component. The attachment feature of the
second component adapted for attaching to the attachment feature of
said first component in a direction generally normal to the
assembly faces.
[0020] According to a further embodiment of the present invention,
there is provided a method for performing arthroplasty on a glenoid
fossa of a scapula. The method includes the steps of providing a
first glenoid component for attachment to the glenoid and attaching
the first glenoid component to the glenoid. The method also
includes the steps of providing a second glenoid component for
attachment to the first glenoid component and attaching the second
glenoid component to the first glenoid component in a direction
generally normal to the longitudinal axis of the first glenoid
component.
[0021] The technical advantages of the present invention include
the ability to reduce problems with aseptic loosening of the
glenoid. For example, according to one aspect of the present
invention, a glenoid implant assembly is provided including a first
component for attachment to the glenoid fossa of a scapula and a
second component removably secured to the first component the
second component is attachable to the first component in a
direction generally normal to the assembly faces of the components.
The portion of the first component for attachment to the glenoid
fossa may include a surface, which assists in the prevention of the
aseptic loosening of the glenoid. Thus the present invention
provides for a reduction in the problem of aseptic loosening of
glenoids.
[0022] The technical advantage of the present invention further
include the ability of the present invention to reduce problems
with the polyethylene bearing coming off the metal support. For
example, according one aspect of the present invention, a glenoid
implant assembly is provided including a first component for
attachment to the glenoid fossa and a second component firmly
secured to the first component. The second component is attached to
the first component in a direction generally normal to the assembly
faces of the first component and the second component. The
polyethylene may be secured to the second component. The second
component may include a feature on the context surface of the
second component that engages the polyethylene to reduce the
incidence of the polyethylene coming off of the second component.
For example, the second component may include a porous or contoured
surface with which the polyethylene may be inferenceably molded
there to. Thus, the present invention provides for a reduction in
the problems with the polyethylene component coming off of the
metal support of the glenoid implant assembly.
[0023] The technical advantages of the present invention also
include the replacement of the polyethylene without removal of the
bone fixation of the glenoid component. For example, according to
one aspect of the present invention, a glenoid component implant
assembly is provided including a first component for attachment to
the glenoid fossa and a second component removably secured to the
first component. The second component is attachable to the first
component in a direction generally normal to the assembly faces.
The second component may include the polyethylene bearing connected
to the second component. The second component including the
polyethylene bearing may be removed from the second component and a
second or replacement second component may be secured to the first
component without removal of the bone fixation of the first
component to the glenoid fossa of the scapula. Thus the present
invention provides for the replacement of the polyethylene bearing
without removal of the bone fixation of the glenoid implant
assembly.
[0024] The technical advantages of the present invention include
the ability of the glenoid implant assembly of the present
invention to permit conversion to a reverse shoulder prosthesis.
For example, according to one aspect of the present invention a
glenoid implant assembly is provided including a first component
for attachment to the glenoid fossa and a second component
removably secured to the first component. The second component may
be designed for a standard prosthesis. An alternative second
component which is design for use with a reverse prosthesis may be
replaced with the second component. Thus the present invention
provides for the conversion of a glenoid implant assembly from a
standard prosthesis to a reverse prosthesis.
[0025] The technical advantages of the present invention include
the ability of the glenoid implant assembly of the present
invention to provide for a wide range of prostheses utilizing a
limited number of components. For example, according to one aspect
of the present invention a glenoid implant kit is provided which
includes a plurality of first components for attachment to the
glenoid fossa and a plurality of components for attachment to the
second components. Each of the plurality of first components
cooperate with each of the second components so that many
combinations of prostheses may be had from a limited number of
components. Thus the present invention provides for a wide variety
of implant offerings with the benefit of part reduction.
[0026] The technical advantages of the present invention further
include the ability to provide prosthetic components with improved
materials without removal of the bone fixation of the glenoid
implant assembly. For example, according to one aspect of the
present invention a glenoid implant assembly is provided including
a first component for attachment to the scapula and a second
component removably attached to the first component. The second
component may include a bearing surface which may be initially made
of, for example, a polyethylene and may later replaced with a
different, second component made of a different material, for
example, a ceramics or a metal. Thus the present invention provides
for replacement of the original articulating bearing material with
a alternate material without removal of the bone fixation of the
glenoid assembly.
[0027] The technical advantages of the present invention further
includes the ability to provide for superior fixation of the
glenoid assembly by providing for many cross-holes in the implant
assembly for use with a corresponding number of screws. For
example, according to one aspect of the present invention a glenoid
implant assembly is provided including a first component for
attachment to the scapula. The first component may include a large
number of cross-holes. A second component is removeably securable
to the first component. Thus the present invention provides for a
glenoid implant assembly which includes may cross-holes.
[0028] The technical advantages of the present invention further
include the ability to use the glenoid implant assembly with vault
fixation. For example, according to one aspect of the present
invention a glenoid implant assembly is provided including a first
component for attachment to the glenoid fossa of the scapula. The
first component includes a feature for securement to the glenoid
vault. A second component is removeably secured to the first
component. Thus the present invention provides for a glenoid
implant assembly that can be used with vault fixation.
[0029] The technical advantages of the present invention further
include the ability to use the glenoid implant assembly of the
present invention to correct defective glenoids with posterior
erosion. For example, according to another aspect of the present
invention a glenoid implant assembly is provided including a first
component for attachment to the glenoid fossa of a scapula. The
first component includes an augmentation or an additional portion
for compensating for a void in the scapula. The glenoid implant
assembly further includes a second component removeably secured to
the first component. Thus the present invention provides for a
glenoid implant assembly that can be used with posterior
erosion.
[0030] Other technical advantages of the present invention will be
readily apparent to one skilled in the art from the following
FIGS., descriptions and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] FIG. 1 is a plan view partially in cross-section of a metal
backed plastic articulating modular glenoid assembly with a tapered
connection and a concave articulating surface according to an
embodiment of the present invention;
[0032] FIG. 2 is an exploded plan view of the metal backed plastic
articulating modular glenoid assembly of FIG. 1;
[0033] FIG. 2A is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with spaced apart components;
[0034] FIG. 2B is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with a threaded connection;
[0035] FIG. 2C is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with a press-fit connection;
[0036] FIG. 2D is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with a ribbed connection;
[0037] FIG. 2E is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with a snap-fit connection;
[0038] FIG. 2F is a plan view partially in cross-section of another
embodiment of the present invention in the form of a modular
glenoid assembly with 2 connections;
[0039] FIG. 3 is a plan view partially in cross-section of an all
plastic prior art glenoid component;
[0040] FIG. 4 is a plan view partially in cross-section of a metal
backed prior art glenoid component;
[0041] FIG. 5 is a plan view partially in cross-section of the
metal backed plastic articulating component of FIGS. 1 and 2;
[0042] FIG. 6 is a plan view partially in cross-section of a metal
backed plastic articulating component of a modular glenoid assembly
with a tapered connection and a convex articulating surface
according to another embodiment of the present invention;
[0043] FIG. 7 is a plan view partially in cross-section of the
fixation component of the modular glenoid assembly 1 and 2;
[0044] FIG. 8 is a plan view partially in cross-section of a
fixation component of a modular glenoid assembly with a tapered
connection and with screw fixation for use with the articulation
component of FIG. 6 according to another embodiment of the present
invention;
[0045] FIG. 9 is a plan view partially in cross-section of a
fixation component of a modular glenoid assembly with a tapered
connection and with a posterior augmentation portion for use with
the articulation component of FIG. 6 according to another
embodiment of the present invention;
[0046] FIG. 9A is a bottom view of FIG. 9;
[0047] FIG. 9B is a bottom view of an ellplical modular glenoid
assembly according to another embodiment of the present
invention;
[0048] FIG. 10 is a plan view partially in cross-section of a
fixation component of a modular glenoid assembly with a tapered
connection and with a vault fixation portion and anti-rotation fins
for use with the articulation component of FIG. 6 according to
another embodiment of the present invention;
[0049] FIG. 10A is a bottom view of FIG. 10;
[0050] FIG. 11 is a plan view of a series of components that may
form a kit with the components partially in cross-section including
three fixation components of a modular glenoid assembly with a
tapered connection, with an augmentation and with a vault fixation
portion and two articulation components of a modular glenoid
assembly with a convex articulation surface and with a concave
articulation surface according to another embodiment of the present
invention; and
[0051] FIG. 12 is a flow chart of a method for performing total
shoulder arthroplasty in accordance with another embodiment of the
present invention.
[0052] Corresponding reference characters indicate corresponding
parts throughout the several views. Like reference characters tend
to indicate like parts throughout the several views.
DETAILED DESCRIPTION OF THE INVENTION
[0053] Embodiments of the present invention and the advantages
thereof are best understood by referring to the following
descriptions and drawings, wherein like numerals are used for like
and corresponding parts of the drawings.
[0054] According to the present invention and referring now to FIG.
1 a glenoid implant assembly 10 is shown. The glenoid implant
assembly 10 includes a first component 12 for attachment to the
glenoid fossa 14 of a scapula 16. First component 12 defines an
assembly face 18.
[0055] The glenoid implant assembly 10 further includes a second
component 20. The second component 20 as shown in FIG. 1 is
removeably secured to the first component 12. The second component
20 includes an assembly face 22. The assembly face 22 of the second
component 20 is in close approximation to the assembly face 18 of
the first component 12. The second component is attachable to the
first component 12 in the direction of arrows 24 in a direction
generally normal to the first assembly face 18 and the second
assembly face 22.
[0056] As shown in FIG. 1, the first component 12 includes an
attachment feature 26. The second component 20 may likewise include
an attachment feature 28. The attachment feature 26 of the first
component 12 may cooperative with the attachment feature 28 of the
second component 20 to secure the second component 20 to the first
component 12.
[0057] Referring now to FIG. 2, the glenoid implant assembly 10 is
shown disassembled. As shown in FIG. 2, the first component
attachment feature 26 may be in the form of a female taper 26 and
the second component attachment feature may be in the form of a
male taper 28. The female taper 26 and the male taper 28 are
preferably designed for intimate engagement therebetween. It should
be appreciated that alternatively the first component attachment
feature may be in the form of a male taper or have a generally
conifrustical shape. Similarly, the second component attachment
feature may be in the form of a female taper or have a cavity
defining a generally conifrustical shape. Periphery 30 of the
second component attachment feature 28 may define an included angle
.theta. therebetween. The angle .theta. is selected to provide
engagement between the first component attachment feature 26 and
the second component attachment feature 28. The angle .theta. may
be selected to provide for a secure or self-locking connection
between the first component 12 and the second component 20. For a
typical material and surface finish the angle .theta. may be, for
example, from about 0.degree. to 25.degree..
[0058] To provide for a self-locking taper the angle .theta. may be
determined by maintaining the formula:
tan(.theta./2).gtoreq.m
[0059] where: .theta.=the included angle of the taper [0060]
m=coefficient of friction of the surface of taper
[0061] Referring now to FIG. 2A an alternate embodiment of the
glenoid implant assembly of the present invention is shown in
glenoid assembly implant 10A. Glenoid implant assembly 10A is
similar to the glenoid implant assembly 10 of FIG. 2 except that
the glenoid implant assembly 10A configured such that the assembly
face 18A of the first component 12A is spaced from or not in
contact with the assembly face 22 of the second component 20A. The
second component 20A is separated from by the first component 12A
simply by the connection of the first component attachment feature
26A to the second component attachment feature 28A.
[0062] Referring now to FIG. 2B an alternate embodiment of the
present invention is shown as glenoid implant assembly 10B. Glenoid
implant assembly 10B of FIG. 2B is similar to the glenoid implant
assembly 10 of FIGS. 1 and 2 except that the glenoid implant
assembly 10B of FIG. 2B includes a threaded connection of the first
component 12B to the second component 20B of a threaded
connection.
[0063] The glenoid implant assembly 10B is similar to the glenoid
implant assembly 10 of FIGS. 1 and 2 and includes a first component
12B, which is secured to second component 20B. The glenoid implant
assembly 10B has an attachment feature different than that of the
glenoid implant assembly 10 of FIGS. 1 and 2.
[0064] For example and is shown in FIG. 2B the glenoid implant
assembly 10B includes a first component attachment feature 26B in
the form of a cavity defining internal threads which mates with a
second component attachment feature 28B in the form of external
threads. The external threads 28B of the second component 20B are
threadably engagable with the internal threads 26B of the first
component 12B.
[0065] According to the present invention and referring now to FIG.
2C another embodiment of the present invention is shown as glenoid
implant assembly 10C. Glenoid implant assembly 10C is similar to
the glenoid implant 10 of FIGS. 1 and 2 and includes a first
component 12C, which is matingly fitted to the second component
20C. The glenoid implant assembly 10C is different from the glenoid
implant assembly 10 of FIGS. 1 and 2 in that the glenoid implant
assembly 10C includes a first attachment feature 26C in the form of
a generally cylindrical opening as well as a second attachment
feature 28C extending from the second component 20C in the form of
a cylindrical protrusion. The first component 12C is secured to the
second component 20C by an interference fit between the cylindrical
opening on cavity 26C and the cylindrical protrusion 28C.
[0066] Referring now to FIG. 2D another embodiment of the present
invention is shown as glenoid implant assembly 10D. The glenoid
implant assembly 10D includes a first component 12D which is
secureably fastened to the second component 20D. The glenoid
implant assembly 10D is different from the glenoid implant assembly
10 of FIGS. 1 to 2 in that the glenoid implant assembly 10D
includes a first component attachment feature 26D in the form of an
internal groove formed into a cavity on the first component 12D
which cooperates with an external rib 28D formed on a protrusion
extending from second component 20D. The external rib 28D matingly
fits into the internal groove 26D.
[0067] Yet another embodiment of the present invention is shown as
glenoid implant assembly 10E. The glenoid implant assembly 10E is
similar to the glenoid implant assembly 10 of FIGS. 1 and 2. For
example, and is shown in FIG. 2E, the glenoid implant assembly 10E
includes a first component 12E which is matingly secured to a
second component 20E.
[0068] The glenoid implant assembly 10E is different from the
glenoid implant assembly 10 of FIGS. 1 and 2 in that the glenoid
implant assembly 10E includes a first component attachment feature
26E in the form of an internal notch formed in the first component
12E which matingly engages with an external lip 28E formed on a
protrusion extending from second component 20E. The internal notch
26E mates with the external lip 28E to form a secure connection of
the first component 12E to the second component 20E.
[0069] Referring now to FIG. 2F another embodiment of the present
invention is shown as glenoid implant assembly 10F. The glenoid
implant assembly 10F is similar to the glenoid implant assembly 10
of FIGS. 1 and 2 and includes a first component 12F which is
matingly secured to a second component 20F. The glenoid implant
assembly 10F of FIG. 2F is different from the glenoid implant
assembly 10 of FIGS. 1 and 2 in that the glenoid implant assembly
10F has a pair or two separate attachment features.
[0070] For example and is shown in FIG. 2F the glenoid implant
assembly 10F includes a first external protrusion 28F as well as a
second spaced apart external protrusion 29F. Both protrusion 28F
and 29F extend from the second component 20F. The first external
protrusion 28F mates with first internal cavity 26F formed in the
first component 12F. Similarly, a second internal cavity 27F is
formed on the first component 12F and mates with second external
protrusion 29F. Centerlines 30F of 31F of protrusion 28F and 29F
respectively may be parallel to each other and may be normal to or
at acruate angle to the first component 12F. The acruate angle may
assist in minimally invasive procedures.
[0071] Referring now to FIG. 5 the second component of the modular
glenoid assembly 10 is shown in greater detail. This second
component 20 may be made of any suitable durable material and may
for example be made of a metal, a composite, a ceramic or a
plastic. The second component 20 is preferably made from a material
that may be sterilized by a currently available sterilizing
technique such as gas plasma, gamma irradiation, ETO, or by
autoclaving.
[0072] The second component 20 may be of a one piece or unitary
design or may, as shown in FIG. 5, be modular or made of more than
one component. If made of more than one component, the second
component 20 may include a first portion 32 which may include the
external taper connection 28 and a second portion 34 connected to
the first portion 32. Since, as is shown in FIG. 5, the first
portion 32 includes the tapered connection 28, the first component
32 is preferably made of a rigid material to obtain a secure
tapered connection to the first component 12. For example and is
shown in FIG. 5, the first portion 32 may be in the form of a metal
backing.
[0073] The first portion 32 may be made of any suitable durable
material for example a metal. If made of a metal the metal backing
32 may be made for example a cobalt chromium alloy, a stainless
steel alloy, or a titanium alloy. Metal backing 32 includes the
assembly face 22 as well as a connecting face 36 opposed to the
assembly face 22.
[0074] The connecting face 36 may include a feature 38 on the
connecting face 36 for enhancing the securing of the second portion
34 of the second component 20 to the first portion 32 of the second
component 20. The feature 38 may, for example, be in the form of a
roughened surface or may include a coating, for example, a porous
coating. For example, the feature 38 may be in the form of a
Porocoat.RTM. surface as provided by DePuy Orthopaedics Warsaw,
Ind. The Porocoat.RTM. coating is more fully described in U.S. Pat.
No. 3,855,638 to Pilliar hereby incorporated by reference in its
entirety.
[0075] The second portion 34 of the second component 20 may, as
shown in FIG. 5, be in the form of a plastic bearing. The plastic
bearing 34 may include a connecting face 40 for contact with the
first portion 32. The contacting face 40 cooperates with contacting
face 36 of the first portion 32. The plastic bearing 34 may also
include a concave articulating surface 42 for cooperation with the
humeral component of a total shoulder joint. The plastic bearing 34
may be made of any suitable, durable material and may, as shown in
FIG. 5, be made of an ultra-high molecular weight polyethylene. For
example, the ultra-high molecular weight polyethylene may be a
cross-linked, ultra-high molecular weight polyethylene. For example
the plastic bearing 34 may be made of a material in the form of a
Marathon.RTM. plastic as described in U.S. Pat. No. 6,281,264 to
McKellop.
[0076] The second component 20 of the modular glenoid assembly 10
may have any suitable shape to form a glenoid for cooperation with
a humeral component to form a total shoulder. For example, the
second component 20, as shown in FIG. 5, may include the first
portion 32 with the assembly face 22 of the second component 20 in
having a generally convex surface defined by a portion of a sphere.
For example, as shown in FIG. 5, the assembly face 22 may be
defined by a radius R1 extending from origin 44. Similarly the
first portion 32 of the second component 20 may further be defined
by the connecting face 36 having a generally concave surface. The
concave connecting face 36 may be in the form of a portion of a
sphere and be defined by a radius R2 extending from the origin
44.
[0077] Similarly, the concave articulating surface 42 of the second
portion 34 of the second component 20 may have a concave shape as
shown in FIG. 5 and may be defined by a portion of a sphere. The
concave articulating surface 42 may be, for example, and as is
shown in FIG. 5 be defined by a radius R3 extending from origin
44.
[0078] It should be appreciated that the second portion 34 of the
second component 20 of the modular glenoid assembly 10 which forms
the articulating surface of the glenoid assembly 10 may be made of
any suitable material that is proven to work as an articulating
surface for an artificial joint. For example the second portion 34
may be made of a plastic, a metal, a composite, or a ceramic. In
fact, a feature of the invention is that the second component 20
may be removed from the first component 12 in such a way that the
first component 12 may remain secured to the glenoid fossa in order
that a alternate or a replacement articulating surface may be
placed in the patient while the first component 12 remains secured
to this glenoid fossa.
[0079] Referring now to FIG. 7 the first component 12 of the
modular glenoid assembly 10 is shown in greater detail. The first
component 12 of the modular glenoid assembly 10 may, as shown in
FIG. 7, be unitary or of a one-piece construction. Alternatively,
it should be appreciated, that the second component 12 may be made
of a multiple components or may be modular.
[0080] The first component 12 may be made of a suitable, durable
material capable for providing support. For the second component 20
for example and is shown in FIG. 7, the first component 12 is made
of a metal. If made of a metal, the first component 12 may be made
of, for example, cobalt chromium alloy, a stainless steel alloy, or
a titanium alloy. It should be appreciated that the first component
12 may be made of a ceramic, a composite, or a plastic. The first
component 12 as shown in FIG. 7 includes a glenoid surface 46 which
is opposed to the assembly face 18 of the first component 12. The
glenoid surface 46 fits against the glenoid fossa 14 of the scapula
16.
[0081] The glenoid surface 46 may, as is shown in FIG. 7, include a
fixation feature 48 located on the glenoid surface 46. The fixation
feature 48 may be in the form for example a roughened surface or an
exterior coating. For example the fixation feature 48 may be in the
form of a coating applied to the surface 46 and may for example be
a porous coating. If a porous coating the fixation feature 48 may
be for example a Porocoat.RTM. porous coating.
[0082] The first component 12 of the modular glenoid assembly 10
may have any suitable shape and may as shown in FIG. 17 include the
glenoid surface 46 having a generally convex surface. For example
the glenoid surface 46 may be in the form of a portion of a sphere
and may be defined by a radius R4 extending from origin 50.
Similarly, the first component 12 may include the assembly face 18
having a generally concave shape. The assembly face 18, as shown in
FIG. 7, may be in the form of a portion of a sphere and may be
defined by radius R5 extending from origin 50.
[0083] In order for the first component 12 to include the
attachment feature 26 in the form of an internal taper the first
component 12 may include a protrusion 52 extending outwardly from
the glenoid surface 46. The protrusion 52 may have a shape
generally similar to the internal taper attachment feature 26. It
should be appreciated that the protrusion 52 may have any shape
capable of accommodating the attachment feature 26 and that the
protrusion 52 may assist in providing anchoring of the first
component 12 into the glenoid.
[0084] According to the present invention and referring to FIG. 6,
another embodiment of the present invention is shown as modular
glenoid assembly 100. The modular glenoid assembly 100 includes a
first component 112 which may be similar or even identical to the
first component 12 of the modular glenoid assembly 10 of FIGS. 1
and 2. The modular glenoid assembly 100 includes a second component
120, which is different than the second component 20 of FIG. 5.
[0085] For example and is shown in FIG. 6 the second component 120
includes a first portion 132 in the form of for example a metal
backing. The metal backing 132 is similar to the metal backing or
first portion 32 of the second component 20 of FIG. 5. The metal
backing 132 includes the assembly face 122 as well as the opposed
connecting face 136. The metal backing 132 also includes the
external tapered portion 128, which extends from the assembly face
122.
[0086] The second component 122 also includes a second portion 134.
The second portion 134 like the second portion 34 of the second
component 20 of FIG. 5 is made of a material suitable for
prosthetic articulation. For example, the second portion 134 may be
made of, for example, a metal, a plastic, or a ceramic. For
example, the second portion 134 may be made of a plastic for
example ultra-high molecular weight polyethylene, for example, a
cross-linked, ultra-high molecular weight polyethylene. The second
portion 134 includes a connecting face 140 which mates with
connecting face 136 of the first portion 132. The second portion
134 also defines a convex articulating surface 142.
[0087] The convex articulating surface 142 may be generally convex
and may, for example, be in the form of a portion of a sphere. For
example the articulating surface 142 may be defined by a radius R6
extending from origin 156. Generally the connecting face 140 may be
generally convex and may be in the form of a portion of a sphere.
For example the connecting face 140 may be defined by a radius R7
extending from origin 158.
[0088] Referring now to FIG. 8, another embodiment of the present
invention is shown as modular glenoid assembly 200. The modular
glenoid assembly 200 includes a second component or articulation
component (not shown) which may be similar or identical to the
second component 20 of FIG. 5. The modular glenoid assembly 200
further includes a first component or fixation component 212 as
shown in FIG. 8. The fixation component 212 is generally similar to
the first component 12 of FIG. 7 and includes a concave assembly
face 218.
[0089] The assembly face 218 may be in the form of a portion of a
sphere and may be defined by a radius R8 extending from origin 250.
Similarly, the fixation component 212 may include a glenoid surface
246 which may be convex. The glenoid surface 246 may, as shown in
FIG. 8, be in the form of a portion of a sphere and be defined by a
radius R9 extending from origin 250. The fixation component 212 may
include a female taper 226 formed in protrusion 252 extending from
the glenoid surface 246 of the fixation component 212.
[0090] Unlike the first component 12 of FIG. 7, the fixation
component 212 of FIG. 8 includes a first opening 260 and a spaced
apart second opening 262. The openings 260 and 262 extend through
the fixation component 212 from the assembly face 218 through the
glenoid surface 246. The openings 260 and 262 are adapted to
receive fasteners for assisting in the securement of the fixation
component 212 to the glenoid fossa 14 of the scapula 16.
[0091] For example as shown in FIG. 8 the modular glenoid assembly
200 further includes a first screw 264 which matingly fits with the
first opening 260 of the first component 212. The modular glenoid
assembly 200 also includes a second screw 266 which mates with
second opening 262 in the first component 212. First screw 264
includes a first screw head 268 for securing the screw 264 to the
fixation component 212. The first screw 264 further includes first
screw threads 270 formed on first screw shank 272. Generally the
second screw 262 includes a second screw head 274 for securement to
the fixation component 212. The second screw 266 also includes
second screw threads 276 formed on second screw shank 278.
[0092] According to the present invention and referring to FIG. 9
another embodiment of the present invention is shown as modular
glenoid assembly 300. The modular glenoid assembly 300 includes an
articulating component (not shown) similar to or identical to the
articulating component or second component 20 of FIG. 5. The
modular glenoid assembly 300 also includes the first fixation
component 312.
[0093] The first component 312 is somewhat similar to the first
component 12 the modular glenoid assembly of FIG. 7 and includes a
glenoid surface 346 for placement against the glenoid fossa 14 of
the scapula 16 as well as an opposed assembly face 318 opposed to
the glenoid surface 346. The first component 312 further includes a
protrusion 352 extending from the glenoid surface 346. An internal
taper 326 is formed in a cavity formed in the protrusion 352.
[0094] Unlike the modular glenoid assembly 10 of FIG. 7, the
modular glenoid assembly 300 of FIG. 9 further includes a
augmentation 380. The augmentation 380 may be an anterior
augmentation or as shown in FIG. 7 be in the form of a posterior
augmentation. Posterior augmentation 380 may have any suitable
shape and is provided to fill or replace a void caused by abnormal
wear of the glenoid fossa 14. For example and as is shown in FIG.
9, the augmentation 380 is in the form of a protrusion extending
downwardly from the glenoid surface 346. The augmentation 380
defines an opening 382 through the augmentation 380. The opening
382 is adapted for receiving a augmentation screw 384 for assisting
in securing the fixation component 312 to the scapula 16. The
augmentation screw 384 may be any suitable bone screw for example a
cancellous screw or a cortical screw.
[0095] Referring now to FIG. 9A, the fixation component 312 of the
modular glenoid assembly 300 is shown in greater detail. The
fixation component 312 includes the posterior augmentation 380
assisting in providing support to a posteriorly eroded glenoid. The
augmentation 380 may extend for 90.degree. or for 180.degree. as
shown in phantom or any angle inbetween.
[0096] Referring now to FIG. 9B an elliptical modular glenoid
assembly 300B is shown. The assembly 300B is similar to the
assembly 300A of FIG. 9A except it is elliptical.
[0097] Referring now to FIG. 10 another embodiment of the present
invention is shown as modular glenoid assembly 400. The modular
glenoid assembly 400 is similar to the modular glenoid assembly 10
of FIGS. 1 and 2 and includes an articulation component (not shown)
similar to or identical to articulation component 20 of the modular
glenoid assembly 10 of FIG. 5. The modular glenoid assembly 400
further includes a fixation component 412 which is somewhat similar
to the fixation component 12 of FIG. 7. The first component 212
includes an assembly face 418 as well as an opposed glenoid surface
446. The fixation component 412 further includes an attachment
feature 426.
[0098] Referring now to FIGS. 10 and 10A, the modular glenoid
assembly 400 is different from the modular glenoid assembly 10 of
FIGS. 1, 2, 5 and 7 in that the modular glenoid assembly 400
further includes a vault fixation portion 480. The vault fixation
portion 480 is used to provide for vault of internal scapula
fixation for the modular glenoid assembly 400. The vault fixation
portion 480 extends downwardly from the glenoid surface 446 of the
fixation component 412. The vault fixation portion 480 may have any
suitable shape and, as is shown in FIG. 10, may have a generally
conifrustical shape. The vault fixation portion 480 may include a
pair of spaced of apart anti-rotation fins 482. The anti-rotation
fins 482 serve to securely position the fixation component 412 in
the scapula 16. Vault fixation glenoid components are more fully
described in U.S. patent application Ser. No. 10/259,045 entitled
"Concave Resurfacing Prosthesis" incorporated herein by reference
in its entirety.
[0099] Referring now to FIG. 11, another embodiment of the present
invention is shown as kit 500. The kit 500 includes a plurality of
articulation components as well as a plurality of fixation
components. As shown in FIG. 11 the kit 500 includes a first
articulation component, for example, articulation component 20. The
articulation component 20 is shown in greater detail in FIG. 5. The
kit 500 further includes a second articulation component 120. The
second articulation component 120 is shown in greater detail in
FIG. 6.
[0100] The kit 500 further includes a first fixation component 212.
The first fixation component 212 more fully shown in FIG. 7. The
kit 500 further includes a second fixation component, for example,
component 312. The second fixation component 312 is shown in
greater detail in FIG. 9.
[0101] The kit 500 may further include a third fixation component
412. The third fixation component 412 is shown in greater detail in
FIG. 10.
[0102] It should be appreciated that the kit 500 may further
include additional articulating components. For example, a third,
fourth, or fifth or more articulation components (not shown).
Similarly, the kit 500 may include additional fixation components,
for example, a fourth fixation component, a fifth fixation
component or additional fixation components (not shown).
[0103] It should be appreciated that the articulating components
may have any suitable shape or size of their articulating surface.
Similarly, it should be appreciated that the fixation components
have any suitable size and shape of the glenoid surface for proper
securement to the scapula. Further, it should be appreciated for
the components of the glenoid kit 500 to the properly interchanged,
the taper protrusions, for example, protrusions 28 of the
articulating component 20, as well as, the tapered protrusion 128
of the second articulating component 120 preferably have identical
sizes and shapes. Similarly, the internal taper 226 of the first
fixation component, the internal taper 326 of the second fixation
component as well as the internal taper 426 of the third fixation
component 412 have similar sizes and shapes. Further the internal
fixation component 226, 326, and 426 are preferably designed to
matingly fitted the external components 28 and 128 of the
articulating components 20 and 120.
[0104] Referring now to FIG. 12, another embodiment of the present
invention is shown as method 600 for performing shoulder surgery.
The method 600 further includes a first step 602 of providing a
first glenoid component for attachment to the glenoid. The method
600 further includes a second step 604 of attaching the first
glenoid component to the glenoid. The method 600 further includes a
third step 606 of providing a second glenoid component to
attachment to the first glenoid component. The method 600 further
includes a fourth step 608 of attaching the second glenoid
component to the first glenoid component in the direction generally
normal to the longitudinal axis of the first glenoid component.
[0105] Although the present invention and its advantages have been
described in detail, it should be understood that various changes,
substitutions, and alterations can be made therein without
departing from the spirit and scope of the present invention as
defined by the appended claims.
* * * * *